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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#) https://grpc.io/
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grpc/doc/qos-dscp.md

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Quality of Service (QoS) using Differentiated services

Differentiated services or DiffServ is a mechanism for classifying network traffic and providing quality of service on IP networks. DiffServ uses dedicated fields in the IP header for packet classification purposes. By marking outgoing packets using a Differentiated Services Code Point (DSCP) the network can prioritize accordingly.

The DSCP value on outgoing packets is controlled by the following channel argument:

  • GRPC_ARG_DSCP
    • This channel argument accepts integer values 0 to 63. See dscp-registry for details.
    • Default value is to use system default, i.e. not set.
    • Only apply to POSIX systems.